Additional chapters cover Recombinant selenoprotein expression in E. coli based upon the redefinition of a UAG codon in an RF1-depleted host strain, Metabolic labeling with radioactive selenium in zebrafish, Low pH isoTOP-ABPP to identify selenocysteines, Expression of selenoproteins via genetic code expansion in mammalian cells, Alpha-methyl selenocysteine as a tool for the study of selenoproteins, Selective selenol fluorescent probes: design, synthesis, structural determinants, and biological applications, and much more.